You are close to what I think is going on.Might have something to do with that whole "Death to Israel!" the Ayatollahs keep chanting.
Come to think of it, they also chant "Death to America!"
Does that count as a national interest?
The control of the straight and oil production are among the last of ways that the Iranian Regime might be able to have any real "world" power.
It makes total sense to me that the Islamotards thought that by taking out as many of the competing oil refineries of their neighbors as they can, the might drive up demand for their own refineries production.
The IDF knows well enough how to keep that from happening.